JP2003165550A - Packaging bag having spout, manufacturing method and manufacturing apparatus for the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a packaging bag having a spout capable of preventing stored content such as liquid or the like stored in the bag from oozing out even when the bag is hung with the spout downward, and its manufacturing method and manufacturing apparatus. <P>SOLUTION: There is provided a packaging bag in which a plastic film is heat sealed and a spout is formed by a heat seal part and a non-heat seal part. Inner surfaces of the film constituting the non-heat seal part of an interface part between the heat seal part and the non-heat seal part in the spout passage are contacted with each other to have no clearance at all. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packaging bag containing a content such as a liquid and having a spout for preventing oozing out after opening, and particularly a packaging bag having a self-closing spout. A method and a manufacturing apparatus.

[0002]

2. Description of the Related Art Conventionally, a self-closing pouring material formed of a flexible material such as a plastic film does not flow out of the liquid stored in the bag even if it is hung with the pouring spout downward after being opened once. A liquid packaging bag having an outlet is known (for example, Japanese Utility Model Laid-Open No. 62-93040). The self-closing spout of these liquid packaging bags is usually formed by heat-sealing a plastic film, and the spout is deformed into a V-shape after opening, so that the liquid stored in the bag flows out. Is to prevent. However, when a liquid with good wettability, which has a contact angle with the material forming the inner surface of the film is 90 degrees or less, is stored inside the bag, the liquid oozes out from the minute gaps in the spout passage due to the capillary phenomenon. There was a problem of going out.

[0003]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems of the prior art, and even if the spout is hung with the spout facing downward after opening the spout, the contents of the liquid or the like contained in the bag will be described. It is an object of the present invention to provide a packaging bag having a spout capable of preventing a substance from seeping out little by little, particularly a packaging bag having a self-closing spout, a manufacturing method and a manufacturing apparatus therefor.

[0004]

As a result of intensive studies to solve the above-mentioned problems, the present inventors have found that a conventional spout that causes bleeding of a liquid or the like contained in a bag is a heat-sealing portion of a spout passage. At the boundary between the non-heat seal part and
It was discovered that it has a minute gap as seen in (B). Then, the inner surface side of the film forming the non-heat-sealed portion side of the boundary portion is in contact with each other so as not to generate a minute gap at the boundary portion [see FIG. 3 (A)]. The present invention has been completed by discovering that bleeding of liquid or the like can be prevented even when a liquid or the like having good properties is stored in the bag.

That is, the present invention has the following configuration. 1. In a packaging bag formed by heat-sealing a plastic film with a spout formed by a heat-sealing part and a non-heat-sealing part, the non-heat-sealing part side of the boundary part between the heat-sealing part and the non-heat-sealing part of the spouting passage is configured. A packaging bag, wherein the inner surface of the film is in contact with each other and has no gap. 2. In the section cut perpendicularly to the spout passage from the spout of the packaging bag, place the non-heat seal part from the boundary part between the heat seal part and the non-heat seal part of the spout passage toward the non heat seal part side. 2. The packaging bag according to 1, wherein the cross-sectional shape formed by the surfaces of the inner surfaces of the opposing films up to a point separated by a distance corresponding to the thickness of the constituent film is a straight line or a convex shape on the inner surface side. . 3. In the section cut perpendicularly to the spout passage from the spout of the packaging bag, from the boundary part between the heat-sealed portion and the non-heat-sealed portion of the spout passage toward the non-heat-sealed side, the inside of the film facing the 3. The packaging bag according to 1 or 2, wherein an angle formed by a tangent line having a boundary between the heat-sealed portion and the non-heat-sealed portion as a base point in the cross-sectional shape formed by the surface is 20 degrees or less. 4. A feature is that a fixed amount chamber is provided above the spout 1.
The packaging bag according to any one of to 3. 5. 5. The packaging bag according to 4, wherein the fixed quantity chamber communicates with the storage chamber of the packaging bag and is partitioned from the storage chamber by a film-shaped valve. 6. Between the spout and the storage room of the packaging bag, at least one or more compartments, which are heat-sealed with a part of the plastic film forming the packaging bag remaining in the width direction of the bag, are provided. The packaging bag according to any one of 1 to 3. 7. 7. The packaging bag according to any one of 1 to 6, wherein the plastic film forming the packaging bag has a heat-sealing polyolefin layer in the innermost layer. 8. When a plastic bag is heat-sealed and a spout is formed with the heat-sealing part and the non-heat-sealing part, when the packaging bag is manufactured, the part corresponding to the non-heat-sealing part of the spout passage of the heating part of the heat-sealing head is not covered. A method of manufacturing a packaging bag, which comprises heat-sealing a plastic film using a heat-sealing head provided with a heatable pressing member. 9. When a plastic bag is heat-sealed and a spout is formed with the heat-sealing part and the non-heat-sealing part, when the packaging bag is manufactured, the part corresponding to the non-heat-sealing part of the spout passage of the heating part of the heat-sealing head is not covered. In addition to providing a pressing part, an elastic pressing member and a metal thin plate are sequentially placed on the pressing part facing the heating part of the heat seal head, and a plastic film is sandwiched between the heating part of the heat seal head and the metal thin plate for heat sealing. A method of manufacturing a packaging bag, comprising: 10. When a plastic bag is heat-sealed and a spout is formed with a heat-sealing part and a non-heat-sealing part, a cooling part is provided at the part corresponding to the non-heat-sealing part of the spout passage of the heating part of the heat-sealing head. A method of manufacturing a packaging bag, comprising heat-sealing a plastic film using a heat-sealing head provided with. 11. 11. The manufacturing method according to 10, wherein a cooling unit is provided at a site corresponding to the non-heat-sealing unit of the spout passage of the heating unit of the heat-sealing head via an elastic member. 12. 12. The manufacturing method according to 10 or 11, wherein a gap is provided between the heating section and the cooling section of the heat seal head. 13. 11. The manufacturing method according to 10, wherein the heating unit and the cooling unit of the heat seal head are configured by one member, and a gap is provided between the heating unit and the cooling unit. 14. In a packaging bag manufacturing device in which a plastic film is heat-sealed and a spout is formed by a heat-sealing part and a non-heat-sealing part, no heat is applied to the part corresponding to the non-heat-sealing part of the spout passage of the heating part of the heat-sealing head. An apparatus for manufacturing a packaging bag, which is provided with a flexible pressing member. 15. In a packaging bag manufacturing device in which a plastic film is heat-sealed and a spout is formed by a heat-sealing part and a non-heat-sealing part, no pressure is applied to the part corresponding to the non-heat-sealing part in the spout passage of the heating part of the heat-sealing head. An apparatus for manufacturing a packaging bag, characterized in that an elastic pressing member and a thin metal plate are sequentially placed on a pressurizing unit facing the heating unit of the heat seal head. 16. In a packaging bag manufacturing device in which a plastic film is heat-sealed and a spout is formed by a heat-sealing part and a non-heat-sealing part, a cooling part is provided at a part corresponding to the non-heat-sealing part of the spout passage of the heating part of the heat-sealing head. An apparatus for manufacturing a packaging bag, comprising: 17. 17. The manufacturing apparatus according to 16, wherein a cooling unit is provided at a site corresponding to a non-heat sealing unit of a spout passage of a heating unit of the heat sealing head via an elastic member. 18. 18. The manufacturing apparatus according to 16 or 17, wherein a gap is provided between the heating unit and the cooling unit of the heat seal head. 19. 17. The manufacturing apparatus according to 16, wherein the heating unit and the cooling unit of the heat seal head are configured by one member, and a gap is provided between the heating unit and the cooling unit.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Next, regarding the features of the present invention,
It will be described with reference to the drawings. FIG. 1 is a plan view of the vicinity of the spout of the packaging bag of the present invention, and FIG. 2 is a schematic cross-sectional view of the entire spout of the packaging bag of FIG. 1 in an unopened state. Further, FIG. 3 is a partially enlarged schematic view of the X part of FIG.
Shows a packaging bag of the present invention, and (B) shows a conventional packaging bag. 4 and 5 are schematic cross-sectional views showing the cross-sectional shape of a section cut perpendicularly to the spout passage from the spout of the packaging bag of FIG. According to the present invention, in the packaging bag 1 in which the plastic film is heat-sealed and the self-sealing spout 3 is formed by the heat-sealing portion 2 and the non-heat-sealing portion 6, the heat-sealing portion 2 and the non-heat-sealing portion of the spout passage 4 are formed. As shown in FIG. 3 (A), the inner surface of the film constituting the non-heat-sealed portion 6 side of the boundary portion A of 6 is in contact with each other in the unopened state and has no gap. It is characterized by being configured.

In the conventional packaging bag having a self-closing spout, the inner surface of the film forming the non-heat-sealing portion 6 side of the boundary portion A between the heat-sealing portion 2 and the non-heat-sealing portion 6 of the spout passage 4 is formed. As shown in FIG. 3 (B), since there is a minute gap 30 in the unopened state, if the spout 3 is opened and the bag is suspended after opening the packaging bag, the gap 30 The contents, such as liquid, sometimes exude due to the capillary phenomenon. In the present invention, by using the manufacturing method and apparatus described later, it is possible to prevent a minute gap 30 from being formed at the boundary portion A between the heat seal portion 2 and the non-heat seal portion 6 of the spout passage 4, It succeeded in eliminating the bleeding of contents such as.

Another feature of the packaging bag of the present invention is that the heat-sealing portion 2 of the spout passage 4 is provided in the section 5 cut perpendicularly to the spout passage 4 from the self-closing spout 3 of the packaging bag. And the non-heat-sealed portion 6 from the boundary portion A toward the non-heat-sealed portion 6 side to the point B which is separated by a distance corresponding to the thickness d of the film constituting the non-heat-sealed portion 6 from the inner surface of the opposing film. The cross-sectional shape formed by the surface is a straight line [Fig. 4 (A)] or a curved line convex toward the inner surface [Fig. 4 (A)].
(B)]. As shown in FIGS. 4 (A) and 4 (B), the cross-sectional shape formed by the film inner surface of the spout is such that both the inner surface of the film forming the front surface and the back surface of the packaging bag are linear or inner surface. In addition to the curved shape convex to the side, one may be linear and the other may be curved to the inner surface side.

Still another feature of the packaging bag of the present invention is that the section 5 cut perpendicularly to the spout passage 4 from the self-sealing spout 3 of the packaging bag has a spout passage 4
From the boundary portion A between the heat-sealing portion 2 and the non-heat-sealing portion 6 toward the non-heat-sealing portion 6 side, the boundary between the heat-sealing portion and the non-heat-sealing portion in the cross-sectional shape formed by the facing inner surface of the film is formed. The angle α (see FIG. 5) formed by the tangent line serving as the base point is set to be 20 degrees or less. When the angle α formed by this tangent line is larger than 20 degrees, the effect of preventing the contents such as liquid from oozing out from the spout is reduced.

In the present invention, the cross-sectional shape of the section 5 cut out from the self-closing spout 3 means that the passage portion 4 of the spout 3 of the packaging bag 1 is sliced in the direction perpendicular to the passage as shown in FIG. This means the shape formed by the inner surface of the film when the cross section of the slice 5 having a width of 5 to 50 μm obtained by observing is observed under an unpressurized state with an optical microscope. The cross-sectional shape of the boundary portion A of the spout 3 of the packaging bag 1 of the present invention is such that, in the unopened state, when the packaging bag is manufactured by heat sealing, the heat seal portion 2 and the non-heat seal portion of the spout passage 4 are formed. The inner surface of the film constituting the non-heat-sealed portion 6 side of the boundary portion A of 6 is in a state of being in close contact as shown in FIGS. 2 and 3 (A), but the section 5 cut out from the spout 3
When observing in a non-pressurized state using an optical microscope,
As shown in FIGS. 4 and 5, the cross-sectional shape of the boundary portion A of the spout 3 is such that the non-heat seal portion 6 side of the boundary portion A is opened.

According to the present invention, the cross-sectional shape of the self-closing spout and the cross-sectional shape of the section cut out from the spout are set to the above-mentioned specific shapes so that the spout can be hung with the spout downward after opening the spout. Even in this case, the contents such as the liquid stored in the bag are prevented from seeping out little by little.

A conventional packaging bag having a self-closing spout is provided with a heat-sealing head of a portion where the spout is formed, as shown in FIG. 6, when the plastic film is heat-sealed to form the spout. A non-pressing portion 22 is provided at a portion corresponding to the non-heat-sealing portion of the spout passage of the heating portion 21, and an elastic pressing member 24 made of silicone rubber or the like is attached to a pressurizing portion 23 facing the heating portion 21 of the heat-sealing head, and Teflon. (Registered trademark) is impregnated and baked, and a glass cloth base material 25 coated with a silicon adhesive on one side, plastic films 26 and 26 constituting a packaging bag, and Teflon are impregnated and baked, and a silicon adhesive is applied on one side. The coated glass cloth base material 25 is placed one by one, the heat seal head is clamped, and the plastic film 26, 26 is applied by the heating unit 21 and the pressing unit 23. , Heat sealed by pressing, was to form a spout.

In this prior art, as shown in FIG. 7, the heating section 21 of the heat seal head is used at the time of heat sealing.
In the non-pressing portion 22, since the elastic pressing member 24 is not pressed, the heat-sealing force is not applied evenly at the boundary between the heat-sealing portion and the non-heat-sealing portion of the spout.
Therefore, as shown in FIG. 3B, a minute gap 30 is formed at the boundary portion A between the heat seal portion 2 and the non-heat seal portion 6 of the spout passage 4. In the section 5 cut perpendicularly to the spout passage 4 from the self-closing spout 3 of the packaging bag, the cross-sectional shape formed by the inner surface of the film is as shown in FIG. In the vicinity of the boundary portion A between the non-heat-sealed portion 6 and the non-heat-sealed portion 6, the outer surface has a convex curved shape [FIG. 8 (A)] or an irregular curved shape [FIG. Of the tangent line with the boundary point A between the
(See FIG. 5) is also greater than 20 degrees. Therefore, in the conventional packaging bag, bleeding of the contents such as liquid occurs from the vicinity of the boundary A between the heat seal portion 2 and the non-heat seal portion 6 of the spout passage 4.

According to the present invention, as shown below, when the plastic film is heat-sealed to produce a packaging bag having a self-closing spout, the present inventors perform heat-sealing of the portion forming the spout. By using the newly developed method and device, the cross-sectional shape of the spout and the cross-sectional shape of the section cut out from the spout are made the above-mentioned specific shapes to prevent leakage of contents such as liquid. .

FIG. 9 is a schematic view showing an example of a main part of a manufacturing method and a manufacturing apparatus of a packaging bag having a self-closing spout according to the present invention. In this example, a detachable non-heatable pressing member 28 is provided at a portion of the heating portion 21 of the heat-sealing head that forms the spout of the packaging bag and corresponds to the non-heat-seal portion of the spout passage. The non-heatable pressing member 28 is
Polyacetal, polyamide, polyimide, polyamideimide, polyetherimide, polyetheretherketone (PEEK), phenol resin, melamine resin, polyphenylene sulfide (PPS), polybutylene terephthalate (PBT), polyethylene terephthalate (PET), epoxy resin, bromine -Epoxy resin, 4-fluoroethylene polymer (PTFE), 3-fluorochloroethylene polymer, 4-fluoroethylene-6-fluoropropylene copolymer (FEP), 4-fluoroethylene-perfluoroalkoxyethylene copolymer (PFA), resin such as ethylene tetrafluoride-ethylene copolymer (ETFE), liquid crystal polymer, or each of the above resins is filled with glass fiber, carbon fiber, or inorganic powder such as alumina or silica. Reinforced resin, Since the temperature of the packaging bag is increased by heat-sealing the packaging bag, it is removed from the heating unit 21 after heat-sealing, and the portion of the pressing member whose temperature is not increased is attached to the heating unit 21. After heating the pressing member or cooling the pressing member 2
Reattach to 1. On the pressing part 23 facing the heating part 21 of the heat seal head, an elastic pressing member 24 made of silicone rubber or the like, a glass cloth base material 25 impregnated with Teflon, baked, and coated with a silicone adhesive on one surface, The plastic films 26, 26 constituting the packaging bag and the glass cloth base material 27 having a Teflon sheet layer on the surface are sequentially placed, the heat seal head is clamped, and the plastic film 26 is heated by the heating unit 21 and the pressurizing unit 23. , 26 are heat-sealed by heating and pressurizing to form a spout.

In this example, by providing the heating section 21 of the heat-sealing head with the non-heating type pressing member 28 which is detachable, the non-heat-sealing section of the spout passage does not reach the temperature required for heat-sealing. It will not be sealed. By providing the non-heatable pressing member 28, the heat-sealing portion and the non-heat-sealing portion of the spout are evenly pressed at the boundary, so that the heat-sealing portion and the non-heat-seal of the spout passage are provided. The inner surface of the film, which constitutes the non-heat-sealed part side of the boundary part of the part,
As shown in FIG. 3A, they are in contact with each other in the unopened state and have no gap.

In addition, the cross-sectional shape of the section cut out from the spout is a straight line or a smooth curved line convex to the inner surface side as shown in FIG. 4A or 4B, and the heat seal portion. The angle α formed by the tangent line with the boundary portion A between 2 and the non-heat-sealed portion 6 as a base point is also 20 degrees or less. Therefore, in this packaging bag, unlike the conventional packaging bag, the contents such as liquid do not seep out from the boundary portion. In this example, the plastic films 26 and 2 that form the packaging bag
The number and material of the glass cloth base materials 25 and 27 interposed between 6 and the heating part 21 or the pressurizing part 23 of the heat seal head are appropriately selected according to the material and thickness of the plastic film forming the packaging bag. It can be omitted or omitted.

FIG. 10 is a schematic view showing another example of the essential parts of the manufacturing method and the manufacturing apparatus of the packaging bag having the self-closing spout according to the present invention. In this example, a non-pressing portion 22 is provided at a portion of the heat-sealing head heating portion 21 that forms the spout of the packaging bag, corresponding to the non-heat-sealing portion of the spout passage. An elastic pressing member 24 made of silicone rubber or the like on the pressing portion 23 facing the
A thin metal plate 29 made of aluminum or the like, a glass cloth substrate 25 impregnated with Teflon, baked and coated with a silicon adhesive on one side, plastic films 26, 26 constituting a packaging bag, Teflon impregnated and baked on one side A glass cloth base material 25 coated with a silicon adhesive is sequentially placed, the heat seal head is clamped, and the heating portions 21 and the pressure portion 23 heat the plastic films 26, 26.
It is heat-sealed by applying pressure to form a spout. At this time, the thin metal plate 29 may be made of aluminum and has a thickness of about 0.1 mm to 0.3 mm, but an optimum material and thickness are selected according to the conditions such as pressure at the time of heat sealing. Can be used.

In this example, by mounting a thin metal plate 29 made of aluminum or the like on an elastic pressing member 24 made of silicone rubber or the like, the heat seal head is clamped by the heating section 21 and the pressing section 23. When the plastic films 26, 26 are heated and pressurized to be heat-sealed, pressure is applied to the elastic pressing member 24 in the non-pressing part 22 of the heating part 21 as in the other parts (heat-sealing part). Therefore, the heat-sealing part and the non-heat-sealing part of the spout of the packaging bag are pressed evenly even at the boundary, so that the non-heat-sealing part of the boundary between the heat-sealing part and the non-heat-sealing part of the spout As shown in FIG. 3 (A), the inner surface of the film forming the side of the section is
In the unopened state, they are in contact with each other and have no gap.

In addition, the cross-sectional shape of the section cut out from the spout has a straight or smooth curved shape convex to the inner surface side as shown in FIG. 4A or 4B, and the heat seal portion. The angle α formed by the tangent line with the boundary portion A between 2 and the non-heat-sealed portion 6 as a base point is also 20 degrees or less. Therefore, in this packaging bag, unlike the conventional packaging bag, the contents such as liquid do not seep out from the boundary portion. The number and material of the glass cloth base material 25 interposed between the plastic films 26, 26 forming the packaging bag and the heating part 21 of the heat seal head or the thin metal plate 29 are determined by the material of the plastic film forming the packaging bag, It can be appropriately selected or omitted depending on the thickness and the like.

FIG. 11 is a schematic view showing another example of the main part of the manufacturing method and the manufacturing apparatus of the packaging bag having the self-closing spout according to the present invention. In this example, a non-pressing portion 22 is provided at a portion of the heat-sealing head heating portion 21 that forms the spout of the packaging bag, corresponding to the non-heat-sealing portion of the spout passage. The pressure part 23 facing to the substrate is impregnated with Teflon, baked, and has a glass cloth substrate 25 coated with a silicon adhesive on one side, plastic films 26, 26 constituting a packaging bag, and Teflon.
A glass cloth substrate 25, which is fired and coated with a silicon adhesive on one side, is sequentially placed, the heat sealing head is clamped, and the heating unit 21 and the pressing unit 23 heat and pressurize the plastic films 26, 26. By doing so, heat sealing is performed to form a spout. In this example, FIG.
Unlike the prior art shown in FIG. 2, the plastic film 26, 26 is uniformly pressed and heat-sealed without using the elastic pressing member 24. The cross-sectional shape of the spout and the section cut out from the spout In order to obtain the desired cross-sectional shape, it is necessary to improve the plane accuracy of the heating section 21 and the pressing section 23 of the heat seal head and to adopt a uniform pressing method.

FIGS. 12 and 13 are schematic views showing another example of the essential parts of the manufacturing method and the manufacturing apparatus of the packaging bag having the self-closing spout according to the present invention. In this example, a passage 42 is provided at a portion corresponding to the non-heat-sealed portion of the spout passage between the heating portions 21 and 21 of the heat-sealing head of the portion forming the spout of the packaging bag so that the refrigerant flows therethrough. The cooling unit 43 is connected to the heating unit 21 of the heat-sealing head so that the side surfaces thereof are parallel to each other.
It should be installed so that there is no step on the heat-sealing surface, which is in contact with the lower end of The cooling unit 43 is made of plastic or ceramics having excellent heat insulation and heat resistance. Cooling unit 43
Examples of a suitable material for forming the resin include polyacetal (POM), polyamide (PA), polybutylene terephthalate (PBT), polyethylene terephthalate (PET), polyphenylene sulfide (PPS),
Polyether ether ketone (PEEK), polyether nitrile (PEN), polysulfone (PSF), polyether sulfone (PES), polyarylate (P
AR), polyimide (PI), polyamide-imide (PA
I), polyether imide (PEI), phenol resin, melamine resin, epoxy resin, brominated epoxy resin, tetrafluoroethylene polymer (PTFE), 4 fluoroethylene-6 fluoropropylene copolymer (FEP), Resin such as tetrafluoroethylene-perfluoroalkoxyethylene copolymer (PFA), tetrafluoroethylene-ethylene copolymer (ETFE), liquid crystal polymer, or one obtained by foaming each of the above resins, or each of the above resins A resin or the like reinforced by filling with inorganic powder such as glass fiber, carbon fiber, alumina, or silica can be used.

Further, in order to balance the heat insulation and heat resistance with the strength, the cooling part 43 may be made of a plurality of resins. The plurality of resins may be formed in multiple layers in parallel with the flow channel 42, or partially different resins may coexist. An elastic pressing member 24 made of silicone rubber or the like is impregnated with Teflon on the pressurizing unit 23 facing the heating unit 21 and the cooling unit 43 of the heat seal head, and a glass cloth coated with a silicone adhesive on one side. Base material 25, plastic film 26 constituting a packaging bag,
26, a glass cloth substrate 27 having a Teflon sheet layer on the surface thereof is sequentially placed, the heat sealing head is clamped, and the heating portion 21 and the pressing portion 23 are used to form the plastic film 2
6 and 26 are heat-sealed by heating and pressurizing to form a spout. At this time, the flow path 42
The cross-sectional shape of is designed so as to obtain an appropriate cooling state according to the desired shape of the spout. As the refrigerant to be passed through the flow path 42, for example, water or ammonia can be used, but an optimum one can be selected and used according to conditions such as temperature at the time of heat sealing.

In this example, by providing the cooling unit 43 between the heating units 21 and 21 of the heat seal head, the portion pressurized by the cooling unit 43 does not reach the temperature required for heat sealing. A non-heat-sealed portion of the outlet passage is formed. Then, the heating unit 2 of the heat seal head
Since the heat-sealing part and the non-heat-sealing part of the spout are uniformly pressed even at the boundary between the heat-sealing part 1 and the cooling part 43 without any step, the heat-sealing part of the spout and the non-heat-sealing part are As shown in FIG. 3A, the inner surface of the film forming the heat seal part side of the boundary part of the heat seal part is in contact with each other in the unopened state and has no gap. Become.

In addition, the cross-sectional shape of the section cut out from the spout is a straight line or a smooth curved line convex to the inner surface side as shown in FIG. 4 (A) or (B), and the heat seal portion. The angle α formed by the tangent line with the boundary portion A between 2 and the non-heat-sealed portion 6 as a base point is also 20 degrees or less. Therefore, in this packaging bag, unlike the conventional packaging bag, the contents such as liquid do not seep out from the boundary portion.

As the structure of the cooling unit 43, a heat exchanger 44 such as a heat pipe as shown in FIG. 13 can be used instead of providing the flow path 42 through which the refrigerant flows. In this example, the heat pipe 44 is embedded in the cooling unit 43, and the upper side of the heat pipe 44 is in the flow path 42 through which the refrigerant has passed and is cooled. At this time, the heat pipe 44
Since the heat exchange is performed between the upper and lower sides, the temperature of the portion pressurized by the cooling unit 43 does not reach the temperature required for heat sealing, so that the non-heat sealing portion of the spout passage is formed.

FIG. 14 is a schematic view showing another example of the main part of the manufacturing method and the manufacturing apparatus of the packaging bag having the self-closing spout according to the present invention. (A) clamps the heat-sealing head. It is a figure which shows the state before, and (B) is a figure which shows the state which clamped the heat-sealing head. In this example, a passage 42 is provided at a portion corresponding to the non-heat-sealed portion of the spout passage between the heating portions 21 and 21 of the heat-sealing head of the portion forming the spout of the packaging bag so that the refrigerant flows therethrough. The cooling unit 43 is connected to the heating unit 21 with their side surfaces in contact with each other.
It is provided through 8. An elastic pressing member 24 made of silicone rubber or the like is impregnated with Teflon on the pressurizing unit 23 facing the heating unit 21 and the cooling unit 43 of the heat seal head, and a glass cloth coated with a silicone adhesive on one side. Base material 25, plastic film 2 constituting a packaging bag
6, 26, a glass cloth substrate 27 having a Teflon sheet layer on the surface thereof is sequentially placed, the heat sealing head is clamped, and the heating unit 21 and the pressing unit 23 heat and pressurize the plastic films 26, 26. By doing so, heat sealing is performed to form a spout. In this case, by adjusting the force of the spring 48 provided in the cooling part 43,
As in (B) of 4, it is possible to uniformly pressurize the heat-sealed portion and the non-heat-sealed portion of the spout. At this time, for example, water or ammonia can be used as the refrigerant to be passed through the flow path 42, but an optimum one can be selected and used according to conditions such as temperature at the time of heat sealing. Further, various kinds of springs such as a spiral spring and a leaf spring can be used as the spring 48, and various rubbers, elastic plastics, or elastic members such as foams thereof may be used instead of these springs. it can.

In this example, similarly to the example shown in FIG.
The cooling unit 4 is provided between the heating units 21 and 21 of the heat seal head.
By providing 3, the temperature of the portion pressurized by the cooling unit 43 does not reach the temperature required for heat sealing, so that the non-heat sealing portion of the spout passage is formed. By forming the spout by such a method, the inner surface of the film forming the non-heat-sealed portion side of the boundary portion between the spout passage heat-sealed portion and the non-heat-sealed portion can be seen as shown in FIG. As described above, they are in contact with each other in the unopened state and have no gap.

In addition, the cross-sectional shape of the section cut out from the pouring outlet is a straight or smooth curved shape convex to the inner surface side as seen in FIG. 4A or 4B, and the heat seal portion. The angle α formed by the tangent line with the boundary portion A between 2 and the non-heat-sealed portion 6 as a base point is also 20 degrees or less. Therefore, in this packaging bag, unlike the conventional packaging bag, the contents such as liquid do not seep out from the boundary portion. Note that, as in the case of the example shown in FIG. 13, as the configuration of the cooling unit 43, a heat exchanger 44 such as a heat pipe can be used instead of providing the flow path 42 in which the refrigerant flows.

FIG. 15 is a schematic view showing another example of the essential parts of the manufacturing method and the manufacturing apparatus of the packaging bag having the self-closing spout according to the present invention. In this example, a cooling unit 43 is provided at a portion corresponding to the non-heat-sealed portion of the spout passage between the heating portions 21 and 21 of the heat-sealing head of the portion forming the spout of the packaging bag, and the heating portion 21. The Peltier element 45 is provided between the cooling unit 43 and the cooling unit 43. At this time, the surface of the heating unit 21 facing the cooling unit 43 is in contact with the heat generating surface 46 of the Peltier element 45, while the surface of the cooling unit 43 facing the heating unit 21 is in contact with the heat absorbing surface 47 of the Peltier element 45. . Also,
On the heat seal surface, the side surfaces of the cooling section 43 and the heating section 21 are in contact with each other so that there is no step. Cooling unit 43
Is made of plastic or ceramics having excellent heat insulation and heat resistance, as in the example shown in FIGS.

Further, in order to balance the heat insulation and heat resistance with the strength, the cooling part 43 may be made of a plurality of resins. The plurality of resins may be formed in multiple layers in parallel with the flow path 42, or partially different resins may coexist. An elastic pressing member 24 made of silicone rubber or the like is impregnated with Teflon on the pressurizing unit 23 facing the heating unit 21 and the cooling unit 43 of the heat seal head, and a glass cloth coated with a silicone adhesive on one side. Base material 25, plastic film 26 constituting a packaging bag,
26, a glass cloth substrate 27 having a Teflon sheet layer on the surface thereof is sequentially placed, the heat sealing head is clamped, and the heating portion 21 and the pressing portion 23 are used to form the plastic film 2
6 and 26 are heat-sealed by heating and pressurizing to form a spout.

In this example, when a current flows through the Peltier element 45, the temperature of the heat generating surface 46 rises to heat the heating section 21. When the temperature of the heating portion 21 does not reach the temperature required for heat sealing the plastic film forming the packaging bag, a heater may be used in combination to obtain the temperature required for forming the heat sealing portion. . On the other hand, the temperature of the cooling part 43 in contact with the heat absorbing surface 47 decreases and does not reach the temperature necessary for heat sealing, so that the non-heat sealing part of the spout passage is formed. On the heat-sealing surface, the heating portions 21, 21 and the cooling portion 43 of the heat-sealing head are provided without any step, so that the heat-sealing portion and the non-heat-sealing portion of the spout are evenly applied at the boundary. Since the pressure is applied, the inside surface of the film forming the non-heat-sealed portion side of the boundary portion between the spout passage heat-sealed portion and the non-heat-sealed portion is in the unopened state as shown in FIG. 3 (A). They are in contact with each other and have no gap.

In addition, the cross-sectional shape of the section cut out from the spout is a straight line or a smooth curved line convex to the inner surface side as shown in FIG. 4A or 4B, and the heat seal portion. The angle α formed by the tangent line with the boundary portion A between 2 and the non-heat-sealed portion 6 as a base point is also 20 degrees or less. Therefore, in this packaging bag, unlike the conventional packaging bag, the contents such as liquid do not seep out from the boundary portion.

FIG. 16 is a schematic view showing another example of the essential parts of the manufacturing method and the manufacturing apparatus of the packaging bag having the self-closing spout according to the present invention. In this example, in the device of FIG.
A gap 49 is provided between the heating unit 21 of the heat seal head and the cooling unit 43 which is provided with the flow path 42 and allows the refrigerant to pass therethrough. As shown in FIG. 16, the gap 49 has a small size (usually about 0.01 to 1 mm) such that the heat-sealed plastic film does not bite and deform at the surface portion in contact with the plastic film. In order to prevent the transfer of heat from the heating unit 21 to the cooling unit 43, it is preferable to have a large size inside.

In the apparatus of FIG. 12, the heating unit 21 and the cooling unit 4
3 are in contact with each other, and a large amount of heat is transferred from the heating unit 21 to the cooling unit 43, so that sufficient heat sealing is performed in the heating unit 21 and the heat sealing is not performed in the cooling unit 43. In order to do so, it is necessary to use a material having a small thermal conductivity, such as plastic or ceramics having excellent heat insulating properties, as the material forming the cooling unit 43. On the other hand, in this example, by providing the gap 49 between the heating unit 21 and the cooling unit 43, it is possible to suppress the transfer of heat from the heating unit 21 to the cooling unit 43, and the cooling unit 43 is Similar to 21, it can be made of metal such as aluminum alloy. Cooling unit 43
When is made of metal, processing is easier and durability is improved as compared with plastics and ceramics, so that it is possible to reduce costs and improve productivity.

The other structure of this apparatus is the same as that of the apparatus shown in FIG. 12, and the heating unit 21 and the cooling unit 4 of the heat seal head are used.
3, the elastic pressing member 24 made of silicone rubber or the like, the glass cloth base material 25 impregnated with Teflon, baked, and coated with a silicon adhesive on one surface,
The plastic films 26, 26 constituting the packaging bag, and the glass cloth base material 27 having a Teflon sheet layer on the surface are sequentially placed, and the heat seal head is clamped to heat the heating unit 2.
1 and the pressurizing unit 23, the plastic film 26, 26
Is heat-sealed by heating and pressurizing to form a spout. A heat insulating member 50 is provided above the heating unit 21 and the cooling unit 43 of the heat seal head.

In this example, similar to the example shown in FIG.
Since the portion pressurized by the cooling unit 43 does not reach the temperature required for heat sealing, a non-heat sealing portion of the spout is formed. By forming the spout by such a method, the inner surface of the film forming the non-heat-sealed portion side of the boundary portion between the spout passage heat-sealed portion and the non-heat-sealed portion can be seen as shown in FIG. As described above, they are in contact with each other in the unopened state and have no gap.

In addition, the cross-sectional shape of the section cut out from the spout has a straight or smooth curved shape convex to the inner surface side as shown in FIG. 4A or 4B, and the heat seal portion. The angle α formed by the tangent line with the boundary portion A between 2 and the non-heat-sealed portion 6 as a base point is also 20 degrees or less. Therefore, in this packaging bag, unlike the conventional packaging bag, the contents such as liquid do not seep out from the boundary portion. Note that, as in the case of the example shown in FIG. 13, as the configuration of the cooling unit 43, a heat exchanger 44 such as a heat pipe can be used instead of providing the flow path 42 in which the refrigerant flows. In addition, in the device in which the cooling unit 43 shown in FIG. 14 is provided via the elastic material 48,
A gap 49 may be provided between the heating unit 21 and the cooling unit 43 of the heat seal head.

FIG. 17 is a schematic view showing another example of the essential parts of the manufacturing method and the manufacturing apparatus of the packaging bag having the self-closing spout according to the present invention. In this example, in the device of FIG.
The heating unit 21 and the cooling unit 43 of the heat seal head are integrally configured by one member such as metal. By integrally forming the heating unit 21 and the cooling unit 43, the heat seal head can be easily assembled, and the head height can be easily managed.

When the heating part 21 and the cooling part 43 are integrally formed of a metal material, the amount of heat transferred from the heating part 21 to the cooling part 43 is large, so the surface of the heating part 21 is required for heat sealing. It is necessary to use a larger heater to maintain the proper temperature. At that time, in order to suppress the transfer of heat from the heating unit 21 to the cooling unit 43, the groove 5
1 is provided to reduce the cross-sectional area of the heat transfer path from the heating section 21 to the cooling section 43 and to lengthen the path,
It is preferable to improve heating / cooling efficiency. The size, shape and number of the grooves 51 can be set appropriately.

The method and apparatus for manufacturing a packaging bag described in each of the above examples are preferably used for manufacturing a packaging bag having a self-closing spout after opening. Further, these manufacturing method and manufacturing apparatus can also be used for manufacturing a packaging bag such as a refilling pouch having a spout for taking out the contents filled in the bag. In this case, for example, as shown in FIG. 6, it is possible to reduce distortion, unevenness, and the like at the boundary between the heat-sealed portion and the non-heat-sealed portion, which are caused by the conventional manufacturing method and manufacturing apparatus, and the appearance is excellent. It is possible to manufacture packaging bags with high commercial value.

The plastic film constituting the packaging bag having the spout according to the present invention is a single-layer film made of a thermoplastic resin having a heat-sealing property, and a thermoplastic resin film having a heat-sealing property is used as an inner layer of the bag. It is possible to use a laminated film having a layer structure of two or more layers in which other films are laminated. Examples of the thermoplastic resin film having heat sealability include polypropylene, propylene-ethylene copolymer, crystalline polybutene-1, crystalline poly-4-methylpentene-1, low-, medium- or high-density polyethylene, and wire. Low density polyethylene, ethylene-vinyl acetate copolymer (EVA),
Ethylene-acrylic acid copolymer (EAA), ethylene-
Polyolefins such as ethyl acrylate copolymer (EEA) and ion-crosslinked olefin copolymer (ionomer); aromatic vinyl copolymers such as polystyrene and styrene-butadiene copolymer; polyvinyl chloride, vinylidene chloride resin, etc. Vinyl halide polymers; nitrile polymers such as acrylonitrile-styrene copolymers and acrylonitrile-styrene-butadiene copolymers; nylon 6,
Polyamides such as nylon 66, para or metaxylylene adipamide; polyesters such as polyethylene terephthalate, polybutylene terephthalate, polytetramethylene terephthalate, poly-1,4-cyclohexane dimethylene terephthalate, polyethylene naphthalate; various polycarbonates; There may be mentioned thermoplastic resins such as polyacetals such as polyoxymethylene.

Particularly preferred materials include, for example, low density polyethylene, linear low density polyethylene, medium density polyethylene, high density polyethylene, polypropylene, propylene-ethylene copolymer, ethylene-vinyl acetate copolymer, ethylenically unsaturated carvone. An olefin resin such as an olefin resin graft-modified with an acid or an anhydride thereof,
An ionomer resin, a polyamide or copolyamide resin having a relatively low melting point or a low softening point, a polyester or copolyester resin, or the like is used.

When a laminated film is used as the plastic film forming the packaging bag, the thermoplastic resin film having the heat sealing property is used as the inner layer of the bag,
A laminated film in which other films are laminated via an adhesive layer as needed is used. As a material for forming the adhesive layer, an adhesive property selected from polyethyleneimine resin, alkyl titanate resin, polyester-isocyanate resin, urethane resin, epoxy resin, polyether resin, olefin resin having a polar group introduced, etc. Use resin.

The film laminated with the heat-sealable resin is not particularly limited, and any of those usually used for packaging bags can be used. As the material suitable for such a film, any of the materials used as the above heat-sealing resin can be used, but it is preferable to select a resin having a higher melting point than the resin used for the inner layer. Further, as another film, a metal foil of aluminum or the like, paper, cellophane or the like and one or more kinds of the above-mentioned plastic films may be used in combination. In particular, in the case of contents requiring gas barrier properties, a polyvinylidene chloride resin, a saponified EVA resin, a resin layer such as nylon or a cyclic olefin copolymer, a resin layer having a metal oxide vapor deposition film such as aluminum or silicon oxide. It is preferable to use a laminated film containing a resin layer containing a clay mineral and a metal foil such as aluminum. A film made of a foam of various synthetic resins can be used in order to impart heat insulating property and rigidity to the film constituting the packaging bag, and also alumina, silica, titanium oxide, calcium carbonate, carbon, talc, etc. It is also possible to use a film made of various synthetic resins in which inorganic substances, glass fibers, etc. are kneaded.

As the layer structure of the laminated film suitable for constituting the packaging bag of the present invention, biaxially stretched polyethylene terephthalate (PET: outer layer) / unstretched linear low density polyethylene (LLDPE: inner layer), biaxially stretched Nylon (outer layer) / LLDPE (inner layer), biaxially stretched PET (outer layer) / aluminum foil (middle layer) / LLDPE (inner layer), biaxially stretched nylon (outer layer) / aluminum foil (middle layer) / LL
DPE (inner layer), biaxially oriented PET (outer layer) / biaxially oriented nylon (middle layer) / LLDPE (inner layer), biaxially oriented PET
(Outer layer) / aluminum foil (middle layer) / biaxially stretched nylon (middle layer) / LLDPE (inner layer). Biaxially oriented PET (outer layer) / aluminum foil (intermediate layer) is used for applications that require high-temperature treatment such as pressure heat treatment.
/ Unstretched polypropylene (PP: inner layer), biaxially stretched PE
T (outer layer) / biaxially stretched nylon (middle layer) / aluminum foil (middle layer) / unstretched PP (inner layer), biaxially stretched PET
(Outer layer) / unstretched PP (inner layer), biaxially stretched nylon (outer layer) / unstretched PP (inner layer), biaxially stretched nylon (outer layer)
/ Aluminum foil (intermediate layer) / unstretched PP (inner layer), inorganic oxide deposited biaxially stretched PET (outer layer) / unstretched PP (inner layer), inorganic oxide deposited biaxially stretched nylon (outer layer) / unstretched PP ( A laminated film using unstretched PP for the inner layer such as the inner layer) can be used. An adhesive layer selected from the above adhesive resins is provided between the layers of these laminated films.

Whether the plastic film has a single layer or a layered structure may be selected according to the property of the contents to be filled in the packaging bag. The plastic film can be produced by a usual method such as a casting method, a T-die method, a calender method or an inflation method. Further, the laminated film can be produced by a usual method such as dry lamination of a preformed film, coating on a base film, and melt coextrusion.

Next, specific examples of the packaging bag of the present invention will be described, but the following specific examples do not limit the present invention. 18 to 22 are views showing an example in which the present invention is applied to a standing pouch, FIG. 18 is a perspective view of the pouch, and FIG. 19 is a schematic sectional view showing a state in which the pouch of FIG. 18 is filled with contents. And, FIG. 20 is a schematic sectional view showing a usage state of the pouch of FIG. 18. 21 and 2
2 is a partially enlarged schematic view of the metering chamber and the spout when the pouch of FIG. 18 is in use, FIG. 21 is a view showing the spout closed, and FIG. 22 is a view showing the spout open. . 21 and 22, (A) is a schematic cross-sectional view of the metering chamber and the spout, and (B) is a diagram showing the state of the contents at the valve (central portion) and the spout, respectively. In addition,
As the pouch body material, a laminated film obtained by laminating a biaxially stretched nylon film having a thickness of 15 μm and a linear low-density polyethylene having a thickness of 130 μm from the outer layer with a urethane adhesive was used. (Adhesive layer thickness: 4 μm)

In this standing pouch 1, the side wall of the pouch is extended outward at a position below the top portion 15 of the pouch to form a branch chamber 16 having a spout 3 and a metering chamber 7 at the tip. Inside the branch chamber 16, a film-shaped valve 9 is heat-sealed to the side wall members 11 and 12 at the upper end portion 13 and the lower end portion 14, respectively, and divides the storage chamber 8 and the fixed amount chamber 7. Lower end 14 of valve 9
An unsealed portion 10 is provided at the center of the storage chamber 8 so that the storage chamber 8 and the fixed amount chamber 7 communicate with each other.

In this standing pouch, after filling the contents of the pouch from the top 15 of the pouch, the top 15
Heat seal and seal the pouch. In order to use this pouch, for example, by engaging the engaging hole 17 provided at the bottom of the pouch with a locking tool such as a hook 18 to invert the pouch (see FIG. 20), the contents are stored in the branch chamber 16. Flow into the fixed amount chamber 7 through the unsealed portion 10 of the valve 9. When the internal pressure of the storage chamber 8 at this time is Po and the internal pressure of the fixed amount chamber 7 is P, P ≦ Po. In addition, the packaging material that constitutes the pouch 1 is bent into a V shape along the heat seal portion 2 at the connection portion of the spout 3 with the fixed amount chamber 7 by the pressure of the liquid content, and the side walls facing each other of the spout are closely attached. So let's
Even after the tip of the spout 3 is opened by adjusting the length and width of the spout 3, the spout 3 has a self-closing property, and contents such as liquid will not flow out.

In order to take out contents such as liquid from the pouch 1, the tip of the spout 3 is opened as shown in FIG. 22, and then the metering chamber 7 is pressed by hand or a jig. At this time, since the spout 3 is not broken, the spout 3 is opened and the contents such as liquid are spouted. At that time, P> Po
Next, the contents such as the liquid try to flow back from the fixed amount chamber 7 to the storage chamber 8 [FIG.
Since it will be in a closed state, backflow of the contents is prevented,
Since all the contents in the metering chamber 7 are poured out from the pouring port 3, it is possible to secure the stability of pouring and excellent quantification. When the pressing of the fixed quantity chamber 7 is stopped, the contents are stored in the storage chamber 8 again.
Is passed through the unsealed portion 10 of the valve 9 and filled in the fixed quantity chamber 7, and the packaging material forming the pouch 1 is bent into a V shape at the connecting portion between the spout 3 and the fixed quantity chamber 7 due to the pressure of the contents. Then, the side walls of the spout 3 facing each other are brought into close contact with each other to close the spout 3.

By using the manufacturing apparatus shown in FIGS. 9 to 17, this standing pouch 1 defines the cross-sectional shape of the self-closing spout and the cross-sectional shape of the section cut from the spout according to the present invention. Even if the spout is hung with the spout facing down after the spout is opened, the contents such as the liquid contained in the bag are prevented from bleeding out little by little from the spout.

FIG. 23 shows a case where the present invention is applied to a flat pouch.
It is a figure which shows an example. In this example, when the peripheral portion 32 of the plastic film is heat-sealed to form the pouch 31 having the self-closing spout 33 at the tip, the pouch 3
The first partition 34, 34 and the second partition 35, 35 are provided by heat-sealing the plastic film over the width direction of 1, and the inside of the pouch is the storage chamber 38,
It is divided into a buffer chamber 36 communicating with the storage chamber 38 and a fixed amount chamber 37 connected to the spout 33. This flat pouch 31 is a specific one that defines the cross-sectional shape of the self-closing spout and the cross-sectional shape of the section cut out from the spout by using the manufacturing apparatus shown in FIGS. Even when the spout is hung with the spout facing downward after the spout is opened, the contents such as the liquid contained in the bag are prevented from oozing out little by little from the spout.

In the standing pouch 1 shown in FIGS. 18 to 22, the film-shaped valve 9 constitutes the metering chamber 7 in the upper portion of the spout 3, but in this pouch 31, the first partition parts 34, 34 formed by heat sealing. Thus, a metering chamber 37 was formed above the spout 33. To take out the contents such as liquid from the pouch 31, the knob 40 provided at the tip of the pouch is pinched with a finger, and the easy-opening processing part 41 such as perforations is formed.
After the tip portion of the spout 33 is opened along with it, the fixed quantity chamber 37 is pressed by a hand or a jig to pour out contents such as liquid. At this time, the content such as liquid tends to flow back from the fixed amount chamber 37 to the storage chamber 38 side, but this backflow can be largely prevented by the first partition portions 34, 34.

In this pouch 31, the first partition 34,
Second partition parts 35, 3 by heat sealing on the upper part of 34
By forming the buffer chamber 36 between the fixed amount chamber 37 and the storage chamber 38 by providing 5, it is possible to prevent the contents such as liquid from flowing back from the fixed amount chamber 37 to the storage chamber 38 at the time of pouring. it can. Further, the buffer chamber 36 allows the pouch 31 to have a narrower liquid passage 39 by the first partition portions 34, 34.
With this configuration, it is possible to prevent the pouch from being deformed in the vicinity of the liquid passage 39.

FIG. 24 is a diagram showing another example in which the present invention is applied to a flat pouch. In the pouch of FIG. 23, the first partition portions 34, 34 and the second partition portions 35, 35 are formed from both sides of the pouch toward the central portion of the pouch, but in the pouch 31, the first partition portion 34 Is heat-sealed from one side of the pouch to the other side of the pouch, and the second partition 35 is provided on the opposite side of the first partition 34.
The interior of the pouch is divided into a storage chamber 38, a buffer chamber 36 communicating with the storage chamber 38, and a metering chamber 37 connected to the spout 33 by providing the above. Other configurations and usage of this pouch 31 are similar to those of the pouch of FIG.

In the flat pouch 31 of FIGS. 23 and 24, an example in which the interior of the pouch 31 is divided into a storage chamber 38, a buffer chamber 36, and a constant volume chamber 37 by providing a first partition and a second partition As explained above, the pouch is provided with only the first partition, and the pouch has a storage chamber and a fixed volume chamber.
Needless to say, it may be a section. Further, the dimensions and shapes of the first compartment and the second compartment can be appropriately selected according to the contents such as the liquid stored in the pouch, the pouch dimensions, and the material.

The contents such as liquid contained in the packaging bag of the present invention are not particularly limited, and any liquid or gel such as liquid detergent, shampoo, rinse, disinfectant, soy sauce, sauce, ketchup is suitable. Can be stored.

[0059]

According to the present invention, even if the spout is hung with the spout facing downward after the spout is opened, the contents such as liquid contained in the bag are prevented from seeping out little by little. A packaging bag having a self-closing spout can be obtained. Further, according to the manufacturing method and the manufacturing apparatus of the present invention, it is possible to easily manufacture the packaging bag having the self-closing spout. Further, according to the manufacturing method and the manufacturing apparatus of the present invention, it is possible to reduce the distortion, unevenness, etc. at the boundary between the heat-sealed portion and the non-heat-sealed portion in the packaging bag having the spout for taking out the contents from the bag. .

[Brief description of drawings]

FIG. 1 is a view showing a spout of a packaging bag of the present invention.

FIG. 2 is a view showing a cross-sectional shape of a spout passage of the packaging bag shown in FIG.

FIG. 3 is a partially enlarged schematic view of an X portion of FIG.

FIG. 4 is a schematic cross-sectional view showing a cross-sectional shape of a section cut perpendicularly to a spout passage from the spout of the packaging bag of FIG.

FIG. 5 is a schematic cross-sectional view showing a cross-sectional shape of a section cut perpendicularly to the spout passage from the spout of the packaging bag of FIG.

FIG. 6 is a schematic view showing a main part of a conventional manufacturing apparatus for a packaging bag having a self-closing spout.

FIG. 7 is a diagram illustrating a state in which the packaging bag is heat-sealed using the apparatus of FIG.

FIG. 8 is a schematic cross-sectional view showing a cross-sectional shape of a section cut perpendicularly to a spout passage from a spout of a conventional packaging bag.

FIG. 9 is a schematic view showing an example of a main part of a manufacturing method of a packaging bag and a manufacturing apparatus of the present invention.

FIG. 10 is a schematic view showing another example of the main part of the manufacturing method and the manufacturing apparatus of the packaging bag of the present invention.

FIG. 11 is a schematic view showing another example of the main parts of the manufacturing method and the manufacturing apparatus of the packaging bag of the present invention.

FIG. 12 is a schematic view showing another example of the main part of the manufacturing method and the manufacturing apparatus of the packaging bag of the present invention.

FIG. 13 is a schematic view showing another example of the main parts of the manufacturing method and the manufacturing apparatus of the packaging bag of the present invention.

FIG. 14 is a schematic view showing another example of the main part of the manufacturing method and the manufacturing apparatus of the packaging bag of the present invention.

FIG. 15 is a schematic view showing another example of the main parts of the manufacturing method and the manufacturing apparatus of the packaging bag of the present invention.

FIG. 16 is a schematic view showing another example of the main part of the manufacturing method and the manufacturing apparatus of the packaging bag of the present invention.

FIG. 17 is a schematic view showing another example of the main part of the manufacturing method and the manufacturing apparatus of the packaging bag of the present invention.

FIG. 18: Application of the present invention to a standing pouch 1
It is a figure which shows an example.

19 is a schematic cross-sectional view showing a state where the pouch of FIG. 18 is filled with contents.

FIG. 20 is a schematic sectional view showing a usage state of the pouch of FIG. 18.

FIG. 21 is a partially enlarged schematic view showing a usage state of the pouch of FIG. 18.

22 is a partially enlarged schematic view showing a usage state of the pouch of FIG.

FIG. 23 is a diagram showing an example in which the present invention is applied to a flat pouch.

FIG. 24 is a diagram showing another example in which the present invention is applied to a flat pouch.

[Explanation of symbols]

1, 31 packaging bag 2, 32 Heat seal part 3, 33 spout 4 outlet passages 5 Section of the spout 6 Non-heat seal part 7, 37 fixed quantity room 8,38 storage room 9 valves 10 Unsealed part 11, 12 Side wall member 13 Upper end of valve 14 Lower end of valve 15 top 16 branch rooms 17 Engagement hole 18 hooks 21 heating part 22 Non-pressing part 23 Pressure unit 24 Elastic pressing member 25, 27 glass cloth base material 26 plastic film 28 Non-heatable pressing member 29 Metal sheet 30 gap 34 First Section 35 Second compartment 36 buffer chamber 39 liquid passage 40 knobs 41 Easy opening processing section 42 channels 43 Cooling unit 44 heat pipe 45 Peltier element 46 Heating surface 47 Endothermic surface 48 springs 49 Gap 50 Heat insulation member 51 groove

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Ichiro Kunihiro             22-4 Okazawa-cho, Hodogaya-ku, Yokohama-shi, Kanagawa               Toyo Seikan Group General Research Institute F term (reference) 3E064 AA01 BA21 BA24 BB03 BC16                       BC18 FA04 HG02 HM01 HN05                       HS05 HS07

Claims (19)

[Claims] 1. A packaging bag, which is formed by heat-sealing a plastic film and in which a spout is formed by a heat-sealing portion and a non-heat-sealing portion, wherein a non-heat at a boundary portion between the heat-sealing portion and the non-heat-sealing portion of the spouting passage. A packaging bag, characterized in that the inner surface of the film constituting the seal portion side is in contact with each other and has no gap. 2. A section cut perpendicularly to the spout passage from the spout of the packaging bag, from the boundary portion between the heat seal portion and the non-heat seal portion of the spout passage toward the non-heat seal portion side, It is characterized in that the cross-sectional shape formed by the inner surface side of the opposing film to a point separated by a distance corresponding to the thickness of the film constituting the non-heat-sealed portion is a straight line or a convex shape on the inner surface side. The packaging bag according to Item 1. 3. A section cut perpendicularly to the spout passage from the spout of the packaging bag, from the boundary portion of the heat seal portion and the non-heat seal portion of the spout passage toward the non-heat seal portion side, The cross-sectional shape formed by the inner surface side of the film facing each other, the angle formed by a tangent line with the boundary between the heat-sealed portion and the non-heat-sealed portion as a base point is 20 degrees or less. Packaging bag. 4. The packaging bag according to claim 1, wherein a fixed quantity chamber is provided above the spout. 5. The packaging bag according to claim 4, wherein the fixed quantity chamber communicates with the storage chamber of the packaging bag and is partitioned from the storage chamber by a film-shaped valve. 6. A plastic film forming a packaging bag is heat-sealed between the spout and a packaging bag storage chamber while leaving a part of the plastic film in the width direction of the packaging bag. The packaging bag according to claim 1, wherein the packaging bag is a packaging bag. 7. The packaging bag according to claim 1, wherein the plastic film forming the packaging bag has a heat-sealing polyolefin layer as the innermost layer. 8. A plastic film is heat-sealed,
When manufacturing a packaging bag in which a spout is formed by the heat seal part and the non-heat seal part, a non-heatable pressing member is provided at a part corresponding to the non-heat seal part of the spout passage of the heating part of the heat seal head. A method for manufacturing a packaging bag, which comprises heat-sealing a plastic film using a heat-sealing head. 9. A plastic film is heat-sealed,
When manufacturing a packaging bag in which a spout is formed by the heat seal part and the non-heat seal part, a non-pressing part is provided at a part corresponding to the non-heat seal part of the spout passage of the heating part of the heat seal head, and heat is applied. A packaging bag, characterized in that an elastic pressing member and a thin metal plate are sequentially placed on a pressurizing part facing the heating part of the seal head, and a plastic film is sandwiched between the heating part of the heat seal head and the thin metal plate for heat sealing. Manufacturing method. 10. A non-heat-sealing part of a spout passage of a heating part of a heat-sealing head when manufacturing a packaging bag in which a plastic film is heat-sealed and a spout is formed by a heat-sealing part and a non-heat-sealing part. A method for manufacturing a packaging bag, which comprises heat-sealing a plastic film using a heat-sealing head having a cooling unit at a portion to be heated. 11. The manufacturing method according to claim 10, wherein a cooling unit is provided at a site corresponding to the non-heat-sealing unit of the spout passage of the heating unit of the heat-sealing head via an elastic member. 12. A heat seal head, wherein a gap is provided between the heating part and the cooling part of the heat seal head.
The manufacturing method described in. 13. The manufacturing method according to claim 10, wherein the heating part and the cooling part of the heat seal head are formed by one member, and a gap is provided between the heating part and the cooling part. 14. A packaging bag manufacturing apparatus in which a plastic film is heat-sealed and a spout is formed by a heat-sealing portion and a non-heat-sealing portion, which corresponds to a non-heat-sealing portion of a spout passage of a heating portion of a heat-sealing head. An apparatus for manufacturing a packaging bag, characterized in that a non-heatable pressing member is provided at a portion to be heated. 15. A manufacturing apparatus for a packaging bag in which a plastic film is heat-sealed and a spout is formed by a heat-sealing portion and a non-heat-sealing portion, which corresponds to a non-heat-sealing portion of a spout passage of a heating portion of a heat-sealing head. An apparatus for manufacturing a packaging bag, characterized in that a non-pressing portion is provided at a portion to be pressed and an elastic pressing member and a thin metal plate are sequentially placed on a pressing portion facing the heating portion of the heat seal head. 16. A manufacturing apparatus for a packaging bag, wherein a plastic film is heat-sealed and a spout is formed by a heat-sealing portion and a non-heat-sealing portion, which corresponds to a non-heat-sealing portion of a spout passage of a heating portion of a heat-sealing head. An apparatus for manufacturing a packaging bag, which is characterized in that a cooling unit is provided at a portion to be operated. 17. The manufacturing apparatus according to claim 16, wherein a cooling section is provided via a resilient member at a portion corresponding to the non-heat sealing section of the spout passage of the heating section of the heat sealing head. 18. The heat seal head according to claim 16, wherein a gap is provided between the heating portion and the cooling portion.
The manufacturing apparatus according to. 19. The manufacturing apparatus according to claim 16, wherein the heating unit and the cooling unit of the heat seal head are formed by one member, and a gap is provided between the heating unit and the cooling unit.